It sounds like a misfire from your description. A PCM may not detect and set a fault code for a misfire right after it is freshly connected, but may need to learn adaptive numerator first. It has to be driven in a particular way first.
Knowing which cylinder is affected may save you time and frustration.
http://www.motor.com...?article_ID=306
Right you are!!!!!!!
Cold start this morning and drove off. I did notice that the van was vibrating or chugging when at rpm. This was noticed when A604 shifted into over drive or approx. 1500 rpm. Upshifting reduced the vibration. I was hoping to isolate the vibration to either misfire or transmission performance. I also noticed that the turn signals that were working yesterday were NOT today. Then after a while they did work.... so that's a mystery too. ( wiring ) Vehicle sat since FEB 2012 in Pacific Northwest Climate until briefly running no in October.
I picked up this van for a test drive and to take over to skilled veteran who could go over this 96 3.8L caravan ES with me. IT handled nicely and it felt that it was missing. I stopped and checked , still no codes reporting in. Then at his driveway, the van dies, barely starts and will not run. We push it into the bay. Further diagnosing pinpoints a couple of things:
COIL PACK:
Coil pack is warm after engine running for about 15 minutes. After stall Van still starts/stalls after 1 hour.
Intermittent spark on some cyllinders. All spark plug wires are NEW! About half of the terminals are energizing and the othes are dead!!!!!
Checking the wiring TO the coil pack indicates ALL wires have signal FROM PCM!
We conclude the coil pack is suspect.
Wiggling 4 wire harness at pack made no difference. ( did notice the insulation is broken there ... so that must be repaired ASAP)
vehicle was towed back to owners residence. I have indicated that I would be still be interested in the van is As is condition and asked what would be a reasonable figure.
so we'll see.
Good suggestion. Really appreciate your opinion!!!!!